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158.94.209.200 has a high threat confidence level of 75%, originating from Amsterdam, The Netherlands, on the Omegatech LTD network (202412). It has been observed across 23 sessions targeting SMTP, with detected attack patterns including smtp open relay probe, First observed on January 23, 2026, most recently active March 9, 2026.
Automated SMTP interaction sequence consistent with open-relay validation or spam delivery testing. The client performs a full transaction flow (EHLO → RSET → MAIL FROM → RCPT TO → DATA → QUIT) and submits a minimal test message containing known probe markers such as t_Smtp.LocalIP. This pattern indicates scripted activity attempting to confirm whether the server allows unauthenticated message relaying or outbound mail submission. Such behavior is commonly observed from spam bot infrastructure validating targets before larger abuse campaigns.